Update docs in preparation for 1.13.0. Change-Id: I3d66f4094fe83c7d29b3ea4003c00ee158c6f9ac
1. Section title changes. 2. Moving the glog discussion into installation.rst 3. Re-working the faqs into two separate chapters. Change-Id: I95dd25bace50f0f9077ef114504999190686963e